Collective agreement coverage or union representation refers to the proportion of people in a country population whose terms and conditions at work are made by collective bargaining, between an employer and a trade union, rather than by individual contracts. This is invariably higher than the union membership rate, because collective agreements almost always protect non-members in a unionised workplace. This means that, rather than individuals who have weaker bargaining power representing themselves in negotiations, people organise to represent each other together when negotiating for better pay and conditions in their workplace. The number of people who are covered by collective agreements is higher than the number of union members (or the "union density" rate), and in many cases substantially higher, because when trade unions make collective agreements they aim to cover everyone at work, even those who have not necessarily joined for membership.
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Causes
The causes of higher or lower collective bargaining coverage are widely debated. Common causes are often identified as including the following:
By country
In the United States in 2015 there were 14.8m union members, and 16.4m people covered by collective bargaining or union representation. Union membership was 7.4% in private sector, but 39% in the public sector. In the five largest states, California has 15.9% union membership, Texas 4.5%, Florida 6.8%, New York 24.7% (the highest in the country), and Illinois had 15.2%.